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A007983 as a simple table

na(n)
10
20
31
42
54
67
710
815
920
1027
1134
1244
1353
1466
1578
1694
17109
18129
19147
20171
21193
22221
23247
24280
25310
26348
27383
28426
29466
30515
31560
32615
33666
34727
35784
36852
37915
38990
391060
401142
411219
421309
431393
441491
451583
461689
471789
481904
492012
502136
512253
522386
532512

[0,0,1,2,4,7,10,15,20,27,34,44,53,66,78,94,109,
 129,147,171,193,221,247,280,310,348,383,426,466,
 515,560,615,666,727,784,852,915,990,1060,1142,
 1219,1309,1393,1491,1583,1689,1789,1904,2012,2136,
 2253,2386,2512]